#! /usr/bin/env python
# -*- coding: utf-8 -*-

from datetime import datetime
from flask import flash, url_for, redirect, render_template, request, current_app, g
from flask_login import current_user, login_user, logout_user, login_required
from app import db
from app.main.forms import EditProfileForm, PostForm
from app.models import User, Post
from app.main import bp
from flask_babel import _, get_locale, lazy_gettext as _l
from guess_language import guess_language
from flask import jsonify
from app.translate import translate


@bp.before_request
def before_request():
    if current_user.is_authenticated:
        current_user.last_seen = datetime.utcnow()
        db.session.commit()

    g.locale = str(get_locale())
    if g.locale.startswith('zh'):
        g.locale = 'zh_CN'


@bp.route("/", methods=["GET", "POST"])
@bp.route("/index", methods=["GET", "POST"])
@login_required
def index():
    form = PostForm()
    if form.validate_on_submit():
        language = guess_language(form.post.data)
        if language == "UNKNOWN" or len(language) > 5:
            language = ""
        if language == "ca":
            language = "en"

        post = Post(body=form.post.data, author=current_user, language=language)
        db.session.add(post)
        db.session.commit()
        flash(_l("Your post is now live!"))
        return redirect(url_for("main.index"))

    page = request.args.get("page", 1, type=int)
    posts = current_user.followed_posts().paginate(page, current_app.config["POSTS_PER_PAGE"], False)
    next_url = url_for("main.index", page=posts.next_num) if posts.has_next else None
    prev_url = url_for("main.index", page=posts.prev_num) if posts.has_prev else None
    return render_template("index.html", title=_l("Home Page"), form=form, posts=posts.items,
                           next_url=next_url, prev_url=prev_url)


@bp.route("/user/<username>")
@login_required
def user(username):
    user = User.query.filter_by(username=username).first_or_404()
    page = request.args.get("page", 1, type=int)
    posts = user.posts.order_by(Post.timestamp.desc()).paginate(page, current_app.config["POSTS_PER_PAGE"], False)
    next_url = url_for("main.user", username=username, page=posts.next_num) if posts.has_next else None
    prev_url = url_for("main.user", username=username, page=posts.prev_num) if posts.has_prev else None

    return render_template("user.html", user=user, posts=posts.items, next_url=next_url, prev_url=prev_url)


@bp.route("/edit_profile", methods=["GET", "POST"])
@login_required
def edit_profile():
    form = EditProfileForm(current_user.username)
    if form.validate_on_submit():
        current_user.username = form.username.data
        current_user.about_me = form.about_me.data
        db.session.commit()
        flash(_l("Your changes have been saved."))
        return redirect(url_for("main.edit_profile"))
    elif request.method == "GET":
        form.username.data = current_user.username
        form.about_me.data = current_user.about_me

    return render_template("edit_profile.html", title=_l("Edit Profile"), form=form)


@bp.route("/follow/<username>")
@login_required
def follow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash(_("User %(username)s not found.", username=username))
        return redirect(url_for("main.index"))

    if user == current_user:
        flash(_l("You cannot follow yourself!"))
        return redirect(url_for("main.user", username=username))

    current_user.follow(user)
    db.session.commit()
    flash(_("You are following %(username)s!", username=username))

    return redirect(url_for("main.user", username=username))


@bp.route("/unfollow/<username>")
@login_required
def unfollow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash(_l("User %(username)s not found.", username=username))
        return redirect(url_for("main.index"))

    if user == current_user:
        flash(_l("You cannot unfollow yourself!"))
        return redirect(url_for("main.user", username=username))

    current_user.unfollow(user)
    db.session.commit()
    flash(_("You are not following %(username)s.", username=username))

    return redirect(url_for("main.user", username=username))


@bp.route("/explore")
@login_required
def explore():
    page = request.args.get("page", 1, type=int)
    posts = Post.query.order_by(Post.timestamp.desc()).paginate(page, current_app.config["POSTS_PER_PAGE"], False)
    next_url = url_for("main.explore", page=posts.next_num) if posts.has_next else None
    prev_url = url_for("main.explore", page=posts.prev_num) if posts.has_prev else None

    return render_template("index.html", title=_l("Explore"), posts=posts.items, next_url=next_url, prev_url=prev_url)


@bp.route("/translate", methods=["POST"])
@login_required
def translate_text():
    return jsonify({"text": translate(request.form["text"], request.form["source_language"], request.form["dest_language"])})


@bp.route("/user/<username>/popup")
@login_required
def user_popup(username):
    user = User.query.filter_by(username=username).first_or_404()
    return render_template("user_popup.html", user=user)
